© @Copyright HELLO! Hello! Magazine Jamie Oliver and his wife Jools treated their daughter Petal to an incredible birthday cake over the weekend – and we want a slice (or three!). RELATED: Jamie Oliver's alternative Easter lunch recipe sparks fan reactionJools shared a photo of Petal, now 12, blowing out the candles on her rich chocolate cake, covered with buttercream icing and topped with lashings of chocolate sauce.